local sub = string.sub
local byte = string.byte
local tcp = ngx.socket.tcp
local null = ngx.null
local type = type
local pairs = pairs
local unpack = unpack
local setmetatable = setmetatable
local tonumber = tonumber
local tostring = tostring
local rawget = rawget
local select = select
--local error = error
 
 
local ok, new_tab = pcall(require, "table.new")
if not ok or type(new_tab) ~= "function" then
    new_tab = function (narr, nrec) return {} end
end
 
 
local _M = new_tab(0, 54)
 
_M._VERSION = '0.26'
 
 
local common_cmds = {
    "get",      "set",          "mget",     "mset",
    "del",      "incr",         "decr",                 -- Strings
    "llen",     "lindex",       "lpop",     "lpush",
    "lrange",   "linsert",                              -- Lists
    "hexists",  "hget",         "hset",     "hmget",
    --[[ "hmset", ]]            "hdel",                 -- Hashes
    "smembers", "sismember",    "sadd",     "srem",
    "sdiff",    "sinter",       "sunion",               -- Sets
    "zrange",   "zrangebyscore", "zrank",   "zadd",
    "zrem",     "zincrby",                              -- Sorted Sets
    "auth",     "eval",         "expire",   "script",
    "sort",                                              -- Others
    "select"
}
 
 
local sub_commands = {
    "subscribe", "psubscribe"
}
 
 
local unsub_commands = {
    "unsubscribe", "punsubscribe"
}
 
 
local mt = { __index = _M }
 
 
function _M.new(self)
    local sock, err = tcp()
    if not sock then
        return nil, err
    end
    return setmetatable({ _sock = sock, _subscribed = false }, mt)
end
 
 
function _M.set_timeout(self, timeout)
    local sock = rawget(self, "_sock")
    if not sock then
        return nil, "not initialized"
    end
 
    return sock:settimeout(timeout)
end
 
 
function _M.connect(self, ...)
    local sock = rawget(self, "_sock")
    if not sock then
        return nil, "not initialized"
    end
 
    self._subscribed = false
 
    return sock:connect(...)
end
 
 
function _M.set_keepalive(self, ...)
    local sock = rawget(self, "_sock")
    if not sock then
        return nil, "not initialized"
    end
 
    if rawget(self, "_subscribed") then
        return nil, "subscribed state"
    end
 
    return sock:setkeepalive(...)
end
 
 
function _M.get_reused_times(self)
    local sock = rawget(self, "_sock")
    if not sock then
        return nil, "not initialized"
    end
 
    return sock:getreusedtimes()
end
 
 
local function close(self)
    local sock = rawget(self, "_sock")
    if not sock then
        return nil, "not initialized"
    end
 
    return sock:close()
end
_M.close = close
 
 
local function _read_reply(self, sock)
    local line, err = sock:receive()
    if not line then
        if err == "timeout" and not rawget(self, "_subscribed") then
            sock:close()
        end
        return nil, err
    end
 
    local prefix = byte(line)
 
    if prefix == 36 then    -- char '$'
        -- print("bulk reply")
 
        local size = tonumber(sub(line, 2))
        if size < 0 then
            return null
        end
 
        local data, err = sock:receive(size)
        if not data then
            if err == "timeout" then
                sock:close()
            end
            return nil, err
        end
 
        local dummy, err = sock:receive(2) -- ignore CRLF
        if not dummy then
            return nil, err
        end
 
        return data
 
    elseif prefix == 43 then    -- char '+'
        -- print("status reply")
 
        return sub(line, 2)
 
    elseif prefix == 42 then -- char '*'
        local n = tonumber(sub(line, 2))
 
        -- print("multi-bulk reply: ", n)
        if n < 0 then
            return null
        end
 
        local vals = new_tab(n, 0)
        local nvals = 0
        for i = 1, n do
            local res, err = _read_reply(self, sock)
            if res then
                nvals = nvals + 1
                vals[nvals] = res
 
            elseif res == nil then
                return nil, err
 
            else
                -- be a valid redis error value
                nvals = nvals + 1
                vals[nvals] = {false, err}
            end
        end
 
        return vals
 
    elseif prefix == 58 then    -- char ':'
        -- print("integer reply")
        return tonumber(sub(line, 2))
 
    elseif prefix == 45 then    -- char '-'
        -- print("error reply: ", n)
 
        return false, sub(line, 2)
 
    else
        -- when `line` is an empty string, `prefix` will be equal to nil.
        return nil, "unknown prefix: \"" .. tostring(prefix) .. "\""
    end
end
 
 
local function _gen_req(args)
    local nargs = #args
 
    local req = new_tab(nargs * 5 + 1, 0)
    req[1] = "*" .. nargs .. "\r\n"
    local nbits = 2
 
    for i = 1, nargs do
        local arg = args[i]
        if type(arg) ~= "string" then
            arg = tostring(arg)
        end
 
        req[nbits] = "$"
        req[nbits + 1] = #arg
        req[nbits + 2] = "\r\n"
        req[nbits + 3] = arg
        req[nbits + 4] = "\r\n"
 
        nbits = nbits + 5
    end
 
    -- it is much faster to do string concatenation on the C land
    -- in real world (large number of strings in the Lua VM)
    return req
end
 
 
local function _do_cmd(self, ...)
    local args = {...}
 
    local sock = rawget(self, "_sock")
    if not sock then
        return nil, "not initialized"
    end
 
    local req = _gen_req(args)
 
    local reqs = rawget(self, "_reqs")
    if reqs then
        reqs[#reqs + 1] = req
        return
    end
 
    -- print("request: ", table.concat(req))
 
    local bytes, err = sock:send(req)
    if not bytes then
        return nil, err
    end
 
    return _read_reply(self, sock)
end
 
 
local function _check_subscribed(self, res)
    if type(res) == "table"
       and (res[1] == "unsubscribe" or res[1] == "punsubscribe")
       and res[3] == 0
   then
        self._subscribed = false
    end
end
 
 
function _M.read_reply(self)
    local sock = rawget(self, "_sock")
    if not sock then
        return nil, "not initialized"
    end
 
    if not rawget(self, "_subscribed") then
        return nil, "not subscribed"
    end
 
    local res, err = _read_reply(self, sock)
    _check_subscribed(self, res)
 
    return res, err
end
 
 
for i = 1, #common_cmds do
    local cmd = common_cmds[i]
 
    _M[cmd] =
        function (self, ...)
            return _do_cmd(self, cmd, ...)
        end
end
 
 
for i = 1, #sub_commands do
    local cmd = sub_commands[i]
 
    _M[cmd] =
        function (self, ...)
            self._subscribed = true
            return _do_cmd(self, cmd, ...)
        end
end
 
 
for i = 1, #unsub_commands do
    local cmd = unsub_commands[i]
 
    _M[cmd] =
        function (self, ...)
            local res, err = _do_cmd(self, cmd, ...)
            _check_subscribed(self, res)
            return res, err
        end
end
 
 
function _M.hmset(self, hashname, ...)
    if select('#', ...) == 1 then
        local t = select(1, ...)
 
        local n = 0
        for k, v in pairs(t) do
            n = n + 2
        end
 
        local array = new_tab(n, 0)
 
        local i = 0
        for k, v in pairs(t) do
            array[i + 1] = k
            array[i + 2] = v
            i = i + 2
        end
        -- print("key", hashname)
        return _do_cmd(self, "hmset", hashname, unpack(array))
    end
 
    -- backwards compatibility
    return _do_cmd(self, "hmset", hashname, ...)
end
 
 
function _M.init_pipeline(self, n)
    self._reqs = new_tab(n or 4, 0)
end
 
 
function _M.cancel_pipeline(self)
    self._reqs = nil
end
 
 
function _M.commit_pipeline(self)
    local reqs = rawget(self, "_reqs")
    if not reqs then
        return nil, "no pipeline"
    end
 
    self._reqs = nil
 
    local sock = rawget(self, "_sock")
    if not sock then
        return nil, "not initialized"
    end
 
    local bytes, err = sock:send(reqs)
    if not bytes then
        return nil, err
    end
 
    local nvals = 0
    local nreqs = #reqs
    local vals = new_tab(nreqs, 0)
    for i = 1, nreqs do
        local res, err = _read_reply(self, sock)
        if res then
            nvals = nvals + 1
            vals[nvals] = res
 
        elseif res == nil then
            if err == "timeout" then
                close(self)
            end
            return nil, err
 
        else
            -- be a valid redis error value
            nvals = nvals + 1
            vals[nvals] = {false, err}
        end
    end
 
    return vals
end
 
 
function _M.array_to_hash(self, t)
    local n = #t
    -- print("n = ", n)
    local h = new_tab(0, n / 2)
    for i = 1, n, 2 do
        h[t[i]] = t[i + 1]
    end
    return h
end
 
 
-- this method is deperate since we already do lazy method generation.
function _M.add_commands(...)
    local cmds = {...}
    for i = 1, #cmds do
        local cmd = cmds[i]
        _M[cmd] =
            function (self, ...)
                return _do_cmd(self, cmd, ...)
            end
    end
end
 
 
setmetatable(_M, {__index = function(self, cmd)
    local method =
        function (self, ...)
            return _do_cmd(self, cmd, ...)
        end
 
    -- cache the lazily generated method in our
    -- module table
    _M[cmd] = method
    return method
end})

return _M
